Abstract
The wettability and interfacial characterization of γ-TiAl alloy on TiC0.78, TiN0.87, and VNx substrates were studied using the Sessile Drop method at 1758 K. The equilibrium apparent contact angle of liquid γ-TiAl alloy are 8° on TiC0.78 substrate, 22° on TiN0.87, but deficient for VNx substrate because of the gradual appearance of solidification phenomena. The spreading mechanism of γ-TiAl/TiC0.78 was ascribed to the product control model, which was determined by the new Ti2AlC formed at the interface. The decreased apparent contact angle of γ-TiAl on TiN0.87 substrate with the slow rate resulted from the combined effect of Ti adsorption at the interface and the decreased surface tension and viscosity of the liquid. The γ-TiAl/VNx system was a dissolution system. The effect of dissolution on apparent contact angle is reflected in the initial stage and progressed synchronously with the movement of the triple-phase line.
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